When you have recently setup Productivity targets and enabled the company graph to show in the user's Timesheet you will also have to Refresh Productivity data for it to show the company productivity graph in the Timesheet.

Follow the below steps.

Click Projects

Click Monthly under Productivity menu

You will find a small icon on top of the screen after this sentence "Data last generated on:"

Move your cursor towards the icon and it will say 'Refresh Productivity data'

Note: If you have any difficulties finding the icon, refer to the image attached